2. 公务员
  3. —I wonder how much you charge for your service. —The first two are free______the third costs $ 30.

—I wonder how much you charge for your service. —The first two are free______the third costs $ 30.

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问题 —I wonder how much you charge for your service. —The first two are free______the third costs $ 30.
选项 A、while
B、until
C、when
D、before
答案A
解析 考查连词的用法。根据句意，这里表示前后句之间的对比，所以用while，表示“而”。语意是“前面两项服务是免费的，而第三项收费30美元”。
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